The other day I released the half-gallon jug cup holder adapter, which uses a milk crate as the holder for the jug. I promised to clean up the crate's parameterization and publish that as well, so I'm making good on that promise today!

The profile here has crates in 50, 100, 150, and 200mm interior wall sizes. If you'd like something else, swing on over to Onshape and customize to your heart's content! You can alter the size of the crate by changing the variables in that Onshape workspace - in the Vars tab. In that tab you'll also find a variable you can toggle as 0 or 1 to decide if you want the bottom to use a solid or open/cross-hatch design. The only variables you should mess with in the workspace are the ones not marked as Calculated. The rest of the vars are calculated based on wall size/thickness.